Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT PLATING QUALITY, PLATING STEEL SHEET, AND MANUFACTURING METHODS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/239206
Kind Code:
A1
Abstract:
The present invention relates to a high-strength hot-dip galvanized steel sheet having excellent plating quality, a plating steel sheet for manufacturing same, and manufacturing methods therefor. A plating steel sheet according to one aspect of the present invention comprises, by wt%, 1.0-8.0% of Mn, 0.05-3% of Si, 0.06-0.4% of C, 0.005-3.0% of Al, 0.04% or less of P, 0.015% or less of S, 1.5% or less of Cr, 0.005% or less of B, and the balance of Fe and inevitable impurities, wherein each of the GDS profile of an Mn component and the GDS profile of an Si component, which are observed from the surface to the depth, sequentially includes a local maximum point and a local minimum point, the difference (the reduced concentration difference of Mn) between a value obtained by dividing the Mn concentration at the local maximum point in the GDS profile of the Mn component by the Mn concentration of a base material, and a value obtained by dividing the Mn concentration at the local minimum point in the GDS profile of the Mn component by the Mn concentration of the base material can be 10% or greater, and the difference (the reduced concentration difference of Si) between a value obtained by dividing the Si concentration at the local maximum point in the GDS profile of the Si component by the Si concentration of the base material, and a value obtained by dividing the Si concentration at the local minimum point in the GDS profile of the Si component by the Si concentration of the base material can be 10% or greater. If no local minimum points appear within 5 μm in depth, the point at a depth of 5 μm is considered to be the point at which the local minimum point appears.
Inventors:
JUNG JIN-HO (KR)
LEE WON-HWI (KR)
KWON SEONG-CHOON (KR)
KANG KI-CHEOL (KR)
JUNG KI-TAEK (KR)
KIM EUN-YOUNG (KR)
LEE WON-HWI (KR)
KWON SEONG-CHOON (KR)
KANG KI-CHEOL (KR)
JUNG KI-TAEK (KR)
KIM EUN-YOUNG (KR)
Application Number:
PCT/KR2023/007967
Publication Date:
December 14, 2023
Filing Date:
June 09, 2023
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C23C28/00; C23C2/06; C23C2/40; C23C28/02; C25D3/20; C25D5/50; C25D7/06; C25D9/04; C25D9/06
Domestic Patent References:
| WO2021166350A1 | 2021-08-26 |
Foreign References:
| KR20130077907A | 2013-07-09 | |||
| KR20150061407A | 2015-06-04 | |||
| JP2000309824A | 2000-11-07 | |||
| KR20070050497A | 2007-05-15 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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